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Title: Pressure-interference testing of the Sumikawa geothermal field

Abstract

Pressure interference tests have been used to determine the permeability structure of the Sumikawa reservoir. Interference tests between wells S-4 and KY-1 have indicated the presence of a very high permeability (140 md) north-south channel in the altered andesite layer. Pressure buildup data from well SN-7D have provided indications of a high transmissivity (kh {approx} 18 darcy-meters) reservoir located in the granodiorite layer, lack of pressure response in nearby shutin Sumikawa wells implies that the reservoir penetrated by SN-7D is isolated from the shallower reservoir in the altered andesites. The ''altered andesite'' and the ''granodiorite'' formations constitute the principal geothermal aquifers at Sumikawa. Pressure interference tests (wells KY-1 and SB-2, and wells KY-2 and SB-3) have also confirmed the presence of moderately high transmissivity ({approx} 2 darcy-meters) dacitic layers in the ''marine-volcanic complex'' formation. Because of its low vertical permeability, the ''marine volcanic complex'' formation constitutes an attractive target for the reinjection of waste geothermal fluids.

Authors:
; ; ;
Publication Date:
Research Org.:
NoneNew Energy and Industrial Technology Development Organization (NEDO), Tokyo, JP
Sponsoring Org.:
USDOE
OSTI Identifier:
888485
Report Number(s):
SGP-TR-134-28
TRN: US200619%%242
Resource Type:
Conference
Resource Relation:
Conference: Proceedings, sixteenth workshop on geothermal reservoir engineering, Stanford University, Stanford, CA, January 23-25, 1991
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 15 GEOTHERMAL ENERGY; ANDESITES; AQUIFERS; BUILDUP; GEOTHERMAL FIELDS; GEOTHERMAL FLUIDS; GRANODIORITES; PERMEABILITY; REINJECTION; RESERVOIR ENGINEERING; TARGETS; TESTING; WASTES; Geothermal Legacy

Citation Formats

Garg, S.K., Pritchett, J.W., Ariki, K., and Kawano, Y.. Pressure-interference testing of the Sumikawa geothermal field. United States: N. p., 1991. Web.
Garg, S.K., Pritchett, J.W., Ariki, K., & Kawano, Y.. Pressure-interference testing of the Sumikawa geothermal field. United States.
Garg, S.K., Pritchett, J.W., Ariki, K., and Kawano, Y.. Tue . "Pressure-interference testing of the Sumikawa geothermal field". United States. doi:. https://www.osti.gov/servlets/purl/888485.
@article{osti_888485,
title = {Pressure-interference testing of the Sumikawa geothermal field},
author = {Garg, S.K. and Pritchett, J.W. and Ariki, K. and Kawano, Y.},
abstractNote = {Pressure interference tests have been used to determine the permeability structure of the Sumikawa reservoir. Interference tests between wells S-4 and KY-1 have indicated the presence of a very high permeability (140 md) north-south channel in the altered andesite layer. Pressure buildup data from well SN-7D have provided indications of a high transmissivity (kh {approx} 18 darcy-meters) reservoir located in the granodiorite layer, lack of pressure response in nearby shutin Sumikawa wells implies that the reservoir penetrated by SN-7D is isolated from the shallower reservoir in the altered andesites. The ''altered andesite'' and the ''granodiorite'' formations constitute the principal geothermal aquifers at Sumikawa. Pressure interference tests (wells KY-1 and SB-2, and wells KY-2 and SB-3) have also confirmed the presence of moderately high transmissivity ({approx} 2 darcy-meters) dacitic layers in the ''marine-volcanic complex'' formation. Because of its low vertical permeability, the ''marine volcanic complex'' formation constitutes an attractive target for the reinjection of waste geothermal fluids.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1991},
month = {Tue Jan 01 00:00:00 EST 1991}
}

Conference:
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  • Discharge of Sumikawa well S-4 in the fall of 1986 was accompanied by in situ boiling. In May of 1989, cold water was injected intermittently into well S-4. During both of these tests, a pressure response was observed in KY-1. In this paper, a new interpretation of the latter pressure interference data is presented. While interpretation of the 1989 test is straightforward, in situ boiling during the 1986 test creates substantial difficulties in assigning an {open_quotes}effective discharge rate{close_quotes}. Because of uncertainties in the {open_quotes}effective discharge rate{close_quotes} history for the 1986 test, the distances to the various reservoir boundaries are notmore » well constrained.« less
  • Discharge of Sumikawa well S-4 in the fall of 1986 was accompanied by in situ boiling. In May of 1989, cold water was injected intermittently into well S-4. During both of these tests, a pressure response was observed in KY-1. In this paper, a new interpretation of the latter pressure interference data is presented. While interpretation of the 1989 test is straightforward, in situ boiling during the 1986 test creates substantial difficulties in assigning an “effective discharge rate”. Because of uncertainties in the “effective discharge rate” history for the 1986 test, the distances to the various reservoir boundaries are notmore » well constrained. « less
  • The permeability structure of the Sumikawa geothermal field in northern Japan has been the subject of an extensive pressure-transient testing investigation since 1986. In this paper, various pertinent data sets are presented and analyzed, including results showing reservoir heterogeneity (i.e. boundary) effects and apparent double porosity behavior. Interference tests between wells SB-3 and SD-2 (both of which have feedpoints in dacitic layers in the ''marine-volcanic complex'' formation) were carried out during 1990. The results have been interpreted to indicate the presence of a moderately high permeability ({approx} 4 darcy-meters) layer with two impermeable boundaries intersecting at a right angle. Themore » 1988 pressure buildup data for well SN-7D are also explained by assuming two impermeable boundaries in a high transmissivity reservoir within the deep ''granodiorite'' formation. Interference tests between wells S-4 and KY-1 have suggested that a very permeable north-south channel is present in the ''altered andesite'' layer. Although the response was successfully interpreted using an ''anisotropic line-source model'' by Garg et al. (1991), a ''double porosity channel model'' seems to be particularly applicable for explaining both the short-term and long-term behavior observed in this series of tests.« less
  • This paper presents some results from a numerical simulation study of the natural state of the liquid-dominated high-temperature Sumikawa geothermal prospect (Pritchett et. al., 1989). Sumikawa is located in the Hachimantai volcanic zone of the Sengan thermal area in northern Honshu, Japan. Exploratory studies have been in progress at Sumikawa since 1981 by Mitsubishi Materials Corporation (MMC) and Mitsubishi Gas Chemical Corporation (MGC); this comprehensive program incorporates a variety of geochemical and geophysical surveys and an extensive preliminary drilling investigation (now exceeding sixteen wells). The drilling program has revealed a complex geological structure and has made possible a very thoroughmore » pressure-transient testing program involving both single-well and long-term interference tests. These exploratory studies have been carried out jointly by MMC and NEDO (the New Energy and Industrial Technology Development Organization, an agency of the Japanese government).« less
  • Production and injection data from slim holes and large-diameter wells at the Sumikawa Geothermal Field, Japan, were analyzed to determine the effect of wellbore diameter on (1) the productivity/injectivity indices, and (2) on the discharge rate. The injectivity indices for Sumikawa boreholes do not depend on borehole diameter in any systematic manner; furthermore, the productivity indices (for boreholes with liquid feeds) are more or less equal to the injectivity indices. For boreholes with liquid feed zones, discharge rates scale with diameter according to a relationship previously presented by Pritchett. Pritchett's scaling rule does not appear to apply to discharge datamore » from boreholes with two-phase feed zones; however, discharge characteristics of slim holes with two-phase feed zones can be used to infer production rates from large-diameter two-phase geothermal wells.« less